Its lights flash. Its sirens blare. This ambulance is on the move! What are an ambulance's lights and sirens for? And who rides in the back of an ambulance? Read this book to find out! Learn all about mighty machines in the Vroom-Vroom series―part of the Lightning Bolt Books™ collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Books™ bring nonfiction topics to life!